Sofa



FIG. 1 is a perspective view of a sofa showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a rear elevation view thereof;

FIG. 4 is a left side elevation view thereof;

FIG. 5 is a right side elevation view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines shown in the drawings are for the purpose of illustrating portions of the article and form no part of the claimed design. 

CLAIM The ornamental design for a sofa, as shown and described. 